Starbucks is making it easier for customers to charge up their smartphones by installing technology in it stores that lets people avoid having to plug their devices into electrical sockets.

The coffee giant said Thursday that it plans to add 100,000 wireless charging stations to its 7,500 company-operated stores in the U.S., as well as to its Teavana tea bars. The rollout will begin with stores in the San Francisco Bay Area.

Customers will be able to charge their smartphones for free by laying them flat on the surface of specially equipped tables and counters. Low-level electricity emitted from these so-called “Powermat Spots,” which look like small black discs, invisibly top off low batteries. No cord is necessary. Customers sitting at the charging stations do not risk electrocution while sipping their lattes, of course.

The technology will, in theory, help end the perpetual battle in Starbucks stores for access to…